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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity securities	$ 5,057		$ 5,057		$ 4,514
Unrealized gains (losses) on equity securities	$ 0	$ 0	$ 0	$ 0
Neumora Therapeutics, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	22.10%		22.10%		23.20%
Equity securities	$ 467		$ 467		$ 603
Unrealized gains (losses) on equity securities	$ 119	$ 153	$ (136)	$ 134
Neumora Therapeutics, Inc. | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		5.00%		5.00%
Neumora Therapeutics, Inc. | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		10.00%		10.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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